bless: [OE] Bless occurs in no other language than English, and originally meant ‘mark with blood’, from some sort of religious rite in which such marking conferred sanctity. It probably goes back to a prehistoric Germanic formation *blōthisōjan, a derivative of *blōtham ‘blood’, which was taken up by no Germanic language other than Old English. Here it produced blētsian, which by the 13th century had become blesse. The word’s connotations of ‘happiness’ and ‘well-being’, which go back at least to the year 1000, were probably influenced by the etymologically unrelated bliss. => blood[bless etymology, bless origin, 英语词源]